SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 564		$ 89		$ 686	$ 396
Acquisition and operating expenses		(1,401)		(1,538)		(2,910)	(3,069)
Income tax (expense) or benefit		(313)		(268)		(557)	(579)
Net of tax		$ 1,388	$ 1,032	$ 1,105	$ 1,293	$ 2,420	$ 2,398
U.S. federal statutory income tax rate		21.00%		21.00%		21.00%	21.00%
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		$ 85		$ (4)		$ 142	$ (29)
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		114		5		192	(15)
Income tax (expense) or benefit	[1]	(24)		(1)		(40)	3
Net of tax		90		4		152	(12)
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		(1)		(1)		(1)	(2)
Income tax (expense) or benefit	[1]	0		0		0	0
Net of tax		(1)		(1)		(1)	(2)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, actuarial gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Acquisition and operating expenses	[2]	(5)		(9)		(11)	(19)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, prior service (cost) credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Acquisition and operating expenses	[2]	0		0		0	0
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) or benefit	[1]	1		2		2	4
Net of tax		$ (4)		$ (7)		$ (9)	$ (15)

[1] Based on 21% tax rate

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 11 for additional details).